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The age of two is a generally accepted age as a yearling is still forming in it's back and is not strong enough to physically carry a heavy human yet. At two however the back is about as fully formed as it will get, though it may change shape the entire life of the horse. Also the joints are mostly formed and able to carry heavier weights. But you should never jump a horse until it's about 3 years old because that's when the joints finally close up.

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13y ago

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